.attendance-calculator {
  max-width: 600px;
  margin: 20px auto;
  padding: 25px;
  border: 3px solid #4CAF50;
  border-radius: 10px;
  font-family: 'Segoe UI', sans-serif;
  background-color: #f9f9f9;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}
.attendance-calculator h2 {
  text-align: center;
  color: #2e7d32;
}
.attendance-calculator label {
  display: block;
  margin-bottom: 12px;
  font-weight: 500;
}
.attendance-calculator input {
  width: 100%;
  padding: 8px;
  margin-top: 4px;
  border-radius: 5px;
  border: 1px solid #ccc;
}
.attendance-calculator button {
  display: block;
  width: 100%;
  padding: 10px;
  background-color: #2e7d32;
  color: white;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  margin-top: 15px;
  cursor: pointer;
}
.attendance-calculator button:hover {
  background-color: #1b5e20;
}
#result {
  margin-top: 25px;
  background-color: #fff;
  padding: 15px;
  border-radius: 8px;
  border: 2px dashed #4CAF50;
}